Page 90 - Physics Form 5 KSSM_Neat

In a Venturi tube, the heights of the water columns in tubes A, B and C show the pressure
at X, Y and Z respectively as shown in Figure 2.47.

A B C The pressure at X is higher
than the pressure at Z because
water flows from X to Z.
Therefore, the height of the
KEMENTERIAN PENDIDIKAN MALAYSIA
From water tap water column in tube A is
higher than the height of the
water column in tube C.

To the sink
SCAN ME
SCAN ME
X Y Z
EduwebTV:
Figure 2.47 Venturi tube Bernoulli’s
Principle
The velocity of water depends on the cross-sectional area http://bit.ly/35IDnG6
of the tube. The smaller the cross-sectional area, the higher the
velocity of the water. From X to Y, the velocity of the water
increases and the water pressure decreases. From Y to Z, the Info GALLERY
velocity of the water decreases and the water pressure increases. When a fluid flows continuously in
Bernoulli's principle states that when the velocity of a fluid a pipe, the smaller the diameter
increases, the pressure in the fluid decreases and vice versa. of the pipe, the higher the velocity
of fluid.
Lift Force
Photograph 2.24 shows an aeroplane taking off at the airport. How is the lift force produced to
lift the aeroplane up into the air?

Lift force

Thrust
Force produced by
the jet engines
Drag
Air resistance that
opposes movement Weight
Gravitational force on
the aeroplane

Photograph 2.11 Aeroplane taking off at the airport

80 LS 2.6.1 2.6.2